The three key symbols in Highway Kings Pro are trucks. Once again, the red truck is Mack Daddy, paying 10 to 2, 50 to 3,500 to 4 and 10,000 for the highest prize of 5. The other two yellow and green trucks can be mixed and matched to form a winning combination. They pay 5 to 2, 20 to 3, 150 to 4 and 1,000 to 5.
Wild is a moustachioed truck driver. This icon replaces all symbols except bonuses and scatters, and it appears on the center of the three reels.

Dispersion is represented by a female truck driver wearing a wide-brimmed red hat. It pays five five, ten four and five hundred. Dispersion does not have to appear on an effective payline.